No. Have you checked the US system? The US is very flexible in the sense that if you're smart then you aren't restricted and can study higher up courses that probably excel in difficulty compared to A levels. In some courses AP may be easier than their A level equivalent but then they aren't supposed to be comparable. For example, AP micro and macro aren't going to be exactly similar to A level economics because they test different things. The former AP is testing a specific sub-branch of economics whereas the later is testing a more broad definition of economics.